A man sits atop a large rock formation, with a boarded up entrance to a cave below. Kentucky explorer and early settler Daniel Boone spent the winter of 1769-1770 in a cave on the Shawnee River in Mercer County, Kentucky.

Full-length portrait of John Charles Frémont (1813-1890), an explorer, politician, and Major General in the Civil War. He was the third Military Governor of California and a senator for California before the Civil War and the fifth Territorial...

Profile portrait of John Charles Frémont (1813-1890), an explorer, politician, and Major General in the Civil War. He was the third Military Governor of California and a senator for California before the Civil War and the fifth Territorial Governor...

"Dali and Gala had every reason to be grateful to America, which had showered them with dollars. Here, as Columbus, the painter kneels on the shore, holding aloft a silver crucifix. Gala appears once more as Virgin Mary, on the banner." (Caption);...